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Betadecay energy 
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#1
Oct413, 09:45 AM

P: 7

I have to work out which if these two betadecay processes are energetically possible, given that the betadecay energy of Li11 is Q = 20 MeV. The two processes are:
(1) 〖Li〗_11→〖Be〗_9+2n (2) 〖Li〗_11→〖He〗_3+〖He〗_8 I am supposed to use the energy conditions for betadecay equations, i.e.: Q={M(Z,A)M(Z+1,A)m_e } c^2 Q={M(Z,A)M(Z1,A)m_e } c^2 But I don’t know which one; in the first process the numbers of neutrons and protons both decrease by one – how is this possible? (In the second process, the number of neutrons decreases by one and the number of protons increases by one, so I guess that is betaminus). Basically, I don’t understand how the decay process works, and from then how to calculate Q when there are two daughter nuclei. So an explanation would be much appreciated. Thanks! 


#2
Oct413, 10:07 AM

Mentor
P: 11,819

This is energy conservation  the total available energy is given by the mass of ##{}^11Li##, and you have to check if that is sufficient to produce all daughter particles. 


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